<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Jun 13, 2012, at 3:16 PM, Hillary Ryan wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: 'Lucida Grande'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">I have a bunch (two dozen) of little objects that I would like to be able to draw on one canvas. At the moment I am passing each object the drawing context which comes from the canvas, letting the object draw itself and then moving onto the next object. By this method, if one object changes I have to redraw the entire canvas. I know in Java you can redraw only part of the canvas. Is there a standard method in Racket for drawing a bunch of objects on a canvas efficiently?</span></blockquote></div><br><div>Yes if I understand your question correctly, but you have to go a little bit deeper in the GUI toolbox. </div><div><br></div></body></html>